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From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Ulrich Drepper <drepper@redhat.com>
Cc: Dan Kegel <dank@kegel.com>, linux-kernel@vger.kernel.org
Subject: Re: Hardware limits on numbers of threads?
Date: Wed, 18 Sep 2002 20:19:27 +0100	[thread overview]
Message-ID: <20020918201927.A27663@kushida.apsleyroad.org> (raw)
In-Reply-To: <3D882500.2000105@redhat.com>; from drepper@redhat.com on Wed, Sep 18, 2002 at 12:02:24AM -0700

Ulrich Drepper wrote:
> > Is this true?  Where does the limit come from?
> 
> This was and is true with the kernel before 2.5.3<mumble> when Ingo 
> introduced TLS support since the thread specific data had to be 
> addressed via LDT entries and the LDT holds at most 8192 entries.  The 
> GDT based solution now implemented in the kernel has no such limitation 
> and the number of threads you can create with the new thread library is 
> only limited by system resources.

So you did not implement LDT entry swapping through the "segment not
present" traps?  Ah well, moot now :-)

-- Jamie

  parent reply	other threads:[~2002-09-18 19:15 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-18  6:43 Dan Kegel
2002-09-18  7:02 ` Ulrich Drepper
2002-09-18 16:30   ` Dan Kegel
2002-09-18 19:19   ` Jamie Lokier [this message]
2002-09-19  9:36   ` Andi Kleen
2002-09-18  7:29 ` Giuliano Pochini
2002-09-18 11:37 ` Denis Vlasenko
2002-09-18  7:05   ` Jakub Jelinek
2002-09-18 11:57 ` Brian Gerst

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